Originally posted by

**augie47**View Post220.5 does not allow us to drop fractions below .5 in general, just in the case of Amps.

So, I am going to calculate the load for a 4500 sq. ft. warehouse.

1. One order of calculation gives me 1125 VA. Dividing by 120V, I get 9.375A and round down to 9A. No questions about that number.

2. But 1125 VA = 1.125 kVA. So I round down to 1.0 kVA, and then get 8.33A, which I round down again to get 8A. I am not actually allowed to do this since I am only allowed to round Amps, not VA or kVA (or KA, for that matter!)

3. OK. Take a different look at it: 1/4 VA per square foot. I don't like working with that, so I will convert it to Amp per square foot at 120 volts. That works out to be .00208 Amps per square foot. That is so small that I can clearly round it down to zero. So 4500 sq. ft. times 0 = 0 Amps calculated load.

4. Or the warehouse is divided into two sections, one of 2000 sq. ft. and one of 2500. Taking them separately, I get 4.17 for the first part and 5.208 for the second. I round both down and get 4 and 5, then add to get 9 amps. That happens to work out the same.

5. Now let's try four sections, of 1195, 1195, 1195, and 915. That gives us 2.49, 2.49, 2.49 and 1.9. Rounding, we get 2, 2, 2, and 2, for a total of 8 Amps again.

It actually can make a difference if you need to multiply and divide several times during an overall calculation or to add two or more numbers, each of which was calculated. The safe (and sane) thing to do is to wait until the calculation has finally produced an Amp number that you need to apply directly before doing the rounding. But the code does not actually say that.

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